perltru64 - Perl version 5 on Tru64 (formerly known as Digital UNIX formerly
known as DEC OSF/1) systems
This document describes various features of HP's (formerly Compaq's, formerly
Digital's) Unix operating system (Tru64) that will affect how Perl version 5
(hereafter just Perl) is configured, compiled and/or runs.
Compiling Perl 5 on Tru64¶
The recommended compiler to use in Tru64 is the native C compiler. The native
compiler produces much faster code (the speed difference is noticeable:
several dozen percentages) and also more correct code: if you are considering
using the GNU C compiler you should use at the very least the release of
2.95.3 since all older gcc releases are known to produce broken code when
compiling Perl. One manifestation of this brokenness is the lib/sdbm test
dumping core; another is many of the op/regexp and op/pat, or ext/Storable
tests dumping core (the exact pattern of failures depending on the GCC release
and optimization flags).
gcc 3.2.1 is known to work okay with Perl 5.8.0. However, when optimizing the
toke.c gcc likes to have a lot of memory, 256 megabytes seems to be enough.
The default setting of the process data section in Tru64 should be one
gigabyte, but some sites/setups might have lowered that. The configuration
process of Perl checks for too low process limits, and lowers the optimization
for the toke.c if necessary, and also gives advice on how to raise the process
Also, Configure might abort with
Build a threading Perl? [n]
Configure: Syntax error at line 1 : 'config.sh' is not expected.
This indicates that Configure is being run with a broken Korn shell (even though
you think you are using a Bourne shell by using "sh Configure" or
"./Configure"). The Korn shell bug has been reported to Compaq as of
February 1999 but in the meanwhile, the reason ksh is being used is that you
have the environment variable BIN_SH set to 'xpg4'. This causes /bin/sh to
delegate its duties to /bin/posix/sh (a ksh). Unset the environment variable
and rerun Configure.
Using Large Files with Perl on Tru64¶
In Tru64 Perl is automatically able to use large files, that is, files larger
than 2 gigabytes, there is no need to use the Configure -Duselargefiles option
as described in INSTALL (though using the option is harmless).
Threaded Perl on Tru64¶
If you want to use threads, you should primarily use the Perl 5.8.0 threads
model by running Configure with -Duseithreads.
Perl threading is going to work only in Tru64 4.0 and newer releases, older
operating releases like 3.2 aren't probably going to work properly with
In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with gcc
because the system header <pthread.h> explicitly checks for supported C
compilers, gcc (at least 3.2.2) not being one of them. But the system C
compiler should work just fine.
Long Doubles on Tru64¶
You cannot Configure Perl to use long doubles unless you have at least Tru64
V5.0, the long double support simply wasn't functional enough before that.
Perl's Configure will override attempts to use the long doubles (you can
notice this by Configure finding out that the modfl()
function does not
work as it should).
At the time of this writing (June 2002), there is a known bug in the Tru64 libc
printing of long doubles when not using "e" notation. The values are
correct and usable, but you only get a limited number of digits displayed
unless you force the issue by using "printf "%.33e",$num"
or the like. For Tru64 versions V5.0A through V5.1A, a patch is expected
sometime after perl 5.8.0 is released. If your libc has not yet been patched,
you'll get a warning from Configure when selecting long doubles.
DB_File tests failing on Tru64¶
The DB_File tests (db-btree.t, db-hash.t, db-recno.t) may fail you have
installed a newer version of Berkeley DB into the system and the -I and -L
compiler and linker flags introduce version conflicts with the DB 1.85 headers
and libraries that came with the Tru64. For example, mixing a DB v2 library
with the DB v1 headers is a bad idea. Watch out for Configure options
-Dlocincpth and -Dloclibpth, and check your /usr/local/include and
/usr/local/lib since they are included by default.
The second option is to explicitly instruct Configure to detect the newer
Berkeley DB installation, by supplying the right directories with
"-Dlocincpth=/some/include" and "-Dloclibpth=/some/lib"
before running "make test" setting your LD_LIBRARY_PATH
The third option is to work around the problem by disabling the DB_File
completely when build Perl by specifying -Ui_db to Configure, and then using
the BerkeleyDB module from CPAN instead of DB_File. The BerkeleyDB works with
Berkeley DB versions 2.* or greater.
The Berkeley DB 4.1.25 has been tested with Tru64 V5.1A and found to work. The
latest Berkeley DB can be found from <http://www.sleepycat.com
64-bit Perl on Tru64¶
In Tru64 Perl's integers are automatically 64-bit wide, there is no need to use
the Configure -Duse64bitint option as described in INSTALL. Similarly, there
is no need for -Duse64bitall since pointers are automatically 64-bit wide.
Warnings about floating-point overflow when compiling Perl on Tru64¶
When compiling Perl in Tru64 you may (depending on the compiler release) see two
warnings like this
cc: Warning: numeric.c, line 104: In this statement, floating-point
overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
and when compiling the POSIX extension
cc: Warning: const-c.inc, line 2007: In this statement, floating-point
overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
The exact line numbers may vary between Perl releases. The warnings are benign
and can be ignored: in later C compiler releases the warnings should be gone.
When the file pp_sys.c
is being compiled you may (depending on the
operating system release) see an additional compiler flag being used:
"-DNO_EFF_ONLY_OK". This is normal and refers to a feature that is
relevant only if you use the "filetest" pragma. In older releases of
the operating system the feature was broken and the NO_EFF_ONLY_OK instructs
Perl not to use the feature.
Testing Perl on Tru64¶
During "make test" the "comp/cpp" will be skipped because on
Tru64 it cannot be tested before Perl has been installed. The test refers to
the use of the "-P" option of Perl.
ext/ODBM_File/odbm Test Failing With Static Builds¶
The ext/ODBM_File/odbm is known to fail with static builds (Configure -Uusedl)
due to a known bug in Tru64's static libdbm library. The good news is that you
very probably don't need to ever use the ODBM_File extension since more
advanced NDBM_File works fine, not to mention the even more advanced DB_File.
Perl Fails Because Of Unresolved Symbol sockatmark¶
If you get an error like
Can't load '.../OSF1/lib/perl5/5.8.0/alpha-dec_osf/auto/IO/IO.so' for module IO: Unresolved symbol in .../lib/perl5/5.8.0/alpha-dec_osf/auto/IO/IO.so: sockatmark at .../lib/perl5/5.8.0/alpha-dec_osf/XSLoader.pm line 75.
you need to either recompile your Perl in Tru64 4.0D or upgrade your Tru64 4.0D
to at least 4.0F: the sockatmark()
system call was added in Tru64 4.0F,
and the IO extension refers that symbol.
Jarkko Hietaniemi <firstname.lastname@example.org>